Sudden unexplainable wi-fi connectivity issue on 2011 Macbook Pro 13"

Hi All,
I've moved to a new apartment, and am having significant issues with my late-2011 Macbook Pro 13". Even in my old place, it wasn't ideal. My old 2005 iBook 12" would work perfectly well coping with wi-fi. As soon as I bought my new machine, I found I couldn't use a torrent client AND browse at the same time.
Since moving, I can barely connect to my wi-fi. The connection usually shows up on the wi-fi network list, showing full signal strength. On trying to connect it either says "connection time-out" or does connect (usually after deleting the connection, and creating a new location). When it does connect, it is so incredibly slow, and frequently can't even load gmail. I thought it was just an ISP/ router problem. I then couldn't connect to anyone elses wi-fi in the building (including a fairly well used pay-per-Mb network the building has).
After resetting the thing numerous times, I pulled out my infrequently used Windows 7 work laptop, old iBook AND a Blackberry, and all three connect and work beautifully everytime!
What could be the issue?

http://www.wi-fiplanet.com/tutorials/7-tips-to-increase-wi-fi-performance.html

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